git.meshlink.io Git - meshlink/blob - src/net.c

   1 /*
   2     net.c -- most of the network code
   3     Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License along
  16     with this program; if not, write to the Free Software Foundation, Inc.,
  17     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "system.h"
  21
  22 #include "utils.h"
  23 #include "conf.h"
  24 #include "connection.h"
  25 #include "graph.h"
  26 #include "logger.h"
  27 #include "meshlink_internal.h"
  28 #include "meta.h"
  29 #include "net.h"
  30 #include "netutl.h"
  31 #include "protocol.h"
  32 #include "sptps.h"
  33 #include "xalloc.h"
  34
  35 #include <assert.h>
  36
  37 #if !defined(min)
  38 static inline int min(int a, int b) {
  39         return a < b ? a : b;
  40 }
  41 #endif
  42
  43 static const int default_timeout = 5;
  44 static const int default_interval = 60;
  45
  46 /*
  47   Terminate a connection:
  48   - Mark it as inactive
  49   - Remove the edge representing this connection
  50   - Kill it with fire
  51   - Check if we need to retry making an outgoing connection
  52 */
  53 void terminate_connection(meshlink_handle_t *mesh, connection_t *c, bool report) {
  54         logger(mesh, MESHLINK_INFO, "Closing connection with %s", c->name);
  55
  56         c->status.active = false;
  57
  58         if(c->node && c->node->connection == c) {
  59                 c->node->connection = NULL;
  60         }
  61
  62         if(c->edge) {
  63                 if(report) {
  64                         send_del_edge(mesh, mesh->everyone, c->edge, 0);
  65                 }
  66
  67                 edge_del(mesh, c->edge);
  68                 c->edge = NULL;
  69
  70                 /* Run MST and SSSP algorithms */
  71
  72                 graph(mesh);
  73
  74                 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
  75
  76                 if(report && c->node && !c->node->status.reachable) {
  77                         edge_t *e;
  78                         e = lookup_edge(c->node, mesh->self);
  79
  80                         if(e) {
  81                                 send_del_edge(mesh, mesh->everyone, e, 0);
  82                                 edge_del(mesh, e);
  83                         }
  84                 }
  85         }
  86
  87         outgoing_t *outgoing = c->outgoing;
  88         connection_del(mesh, c);
  89
  90         /* Check if this was our outgoing connection */
  91
  92         if(outgoing) {
  93                 do_outgoing_connection(mesh, outgoing);
  94         }
  95
  96 #ifndef HAVE_MINGW
  97         /* Clean up dead proxy processes */
  98
  99         while(waitpid(-1, NULL, WNOHANG) > 0);
 100
 101 #endif
 102 }
 103
 104 /*
 105   Check if the other end is active.
 106   If we have sent packets, but didn't receive any,
 107   then possibly the other end is dead. We send a
 108   PING request over the meta connection. If the other
 109   end does not reply in time, we consider them dead
 110   and close the connection.
 111 */
 112 static void timeout_handler(event_loop_t *loop, void *data) {
 113         assert(data);
 114
 115         meshlink_handle_t *mesh = loop->data;
 116         logger(mesh, MESHLINK_DEBUG, "timeout_handler()");
 117
 118         for list_each(connection_t, c, mesh->connections) {
 119                 int pingtimeout = c->node ? mesh->dev_class_traits[c->node->devclass].pingtimeout : default_timeout;
 120                 int pinginterval = c->node ? mesh->dev_class_traits[c->node->devclass].pinginterval : default_interval;
 121
 122                 if(c->outgoing && c->outgoing->timeout < 5) {
 123                         pingtimeout = 1;
 124                 }
 125
 126                 // Also make sure that if outstanding key requests for the UDP counterpart of a connection has timed out, we restart it.
 127                 if(c->node) {
 128                         if(c->node->status.waitingforkey && c->node->last_req_key + pingtimeout <= mesh->loop.now.tv_sec) {
 129                                 send_req_key(mesh, c->node);
 130                         }
 131                 }
 132
 133                 if(c->last_ping_time + pingtimeout <= mesh->loop.now.tv_sec) {
 134                         if(c->status.active) {
 135                                 if(c->status.pinged) {
 136                                         logger(mesh, MESHLINK_INFO, "%s didn't respond to PING in %ld seconds", c->name, (long)mesh->loop.now.tv_sec - c->last_ping_time);
 137                                 } else if(c->last_ping_time + pinginterval <= mesh->loop.now.tv_sec) {
 138                                         send_ping(mesh, c);
 139                                         continue;
 140                                 } else {
 141                                         continue;
 142                                 }
 143                         } else {
 144                                 if(c->status.connecting) {
 145                                         logger(mesh, MESHLINK_WARNING, "Timeout while connecting to %s", c->name);
 146                                 } else {
 147                                         logger(mesh, MESHLINK_WARNING, "Timeout from %s during authentication", c->name);
 148                                 }
 149                         }
 150
 151                         terminate_connection(mesh, c, c->status.active);
 152                 }
 153         }
 154
 155         timeout_set(&mesh->loop, data, &(struct timespec) {
 156                 1, prng(mesh, TIMER_FUDGE)
 157         });
 158 }
 159
 160 // devclass asc, last_successfull_connection desc
 161 static int node_compare_devclass_asc_lsc_desc(const void *a, const void *b) {
 162         const node_t *na = a, *nb = b;
 163
 164         if(na->devclass < nb->devclass) {
 165                 return -1;
 166         }
 167
 168         if(na->devclass > nb->devclass) {
 169                 return 1;
 170         }
 171
 172         if(na->last_successfull_connection == nb->last_successfull_connection) {
 173                 return 0;
 174         }
 175
 176         if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) {
 177                 return -1;
 178         }
 179
 180         if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) {
 181                 return 1;
 182         }
 183
 184         if(na < nb) {
 185                 return -1;
 186         }
 187
 188         if(na > nb) {
 189                 return 1;
 190         }
 191
 192         return 0;
 193 }
 194
 195 // last_successfull_connection desc
 196 static int node_compare_lsc_desc(const void *a, const void *b) {
 197         const node_t *na = a, *nb = b;
 198
 199         if(na->last_successfull_connection == nb->last_successfull_connection) {
 200                 return 0;
 201         }
 202
 203         if(na->last_successfull_connection == 0 || na->last_successfull_connection > nb->last_successfull_connection) {
 204                 return -1;
 205         }
 206
 207         if(nb->last_successfull_connection == 0 || na->last_successfull_connection < nb->last_successfull_connection) {
 208                 return 1;
 209         }
 210
 211         if(na < nb) {
 212                 return -1;
 213         }
 214
 215         if(na > nb) {
 216                 return 1;
 217         }
 218
 219         return 0;
 220 }
 221
 222 // devclass desc
 223 static int node_compare_devclass_desc(const void *a, const void *b) {
 224         const node_t *na = a, *nb = b;
 225
 226         if(na->devclass < nb->devclass) {
 227                 return -1;
 228         }
 229
 230         if(na->devclass > nb->devclass) {
 231                 return 1;
 232         }
 233
 234         if(na < nb) {
 235                 return -1;
 236         }
 237
 238         if(na > nb) {
 239                 return 1;
 240         }
 241
 242         return 0;
 243 }
 244
 245
 246 /*
 247
 248 autoconnect()
 249 {
 250         timeout = 5
 251
 252         // find the best one for initial connect
 253
 254         if cur < min
 255                 newcon =
 256                         first from nodes
 257                                 where dclass <= my.dclass and !connection and (timestamp - last_retry) > retry_timeout
 258                                 order by dclass asc, last_connection desc
 259                 if newcon
 260                         timeout = 0
 261                         goto connect
 262
 263
 264         // find better nodes to connect to: in case we have less than min connections within [BACKBONE, i] and there are nodes which we are not connected to within the range
 265
 266         if min <= cur < max
 267                 j = 0
 268                 for i = BACKBONE to my.dclass
 269                         j += count(from connections where node.dclass = i)
 270                         if j < min
 271                                 newcon =
 272                                         first from nodes
 273                                                 where dclass = i and !connection and (timestamp - last_retry) > retry_timeout
 274                                                 order by last_connection desc
 275                                 if newcon
 276                                         goto connect
 277                         else
 278                                 break
 279
 280
 281         // heal partitions
 282
 283         if min <= cur < max
 284                 newcon =
 285                         first from nodes
 286                                 where dclass <= my.dclass and !reachable and (timestamp - last_retry) > retry_timeout
 287                                 order by dclass asc, last_connection desc
 288                 if newcon
 289                         goto connect
 290
 291
 292         // connect
 293
 294 connect:
 295         if newcon
 296                 connect newcon
 297
 298
 299         // disconnect outgoing connections in case we have more than min connections within [BACKBONE, i] and there are nodes which we are connected to within the range [i, PORTABLE]
 300
 301         if min < cur <= max
 302                 j = 0
 303                 for i = BACKBONE to my.dclass
 304                         j += count(from connections where node.dclass = i)
 305                         if min < j
 306                                 delcon =
 307                                         first from nodes
 308                                                 where dclass >= i and outgoing_connection
 309                                                 order by dclass desc
 310                                 if disconnect
 311                                         goto disconnect
 312                                 else
 313                                         break
 314
 315
 316         // disconnect connections in case we have more than enough connections
 317
 318         if max < cur
 319                 delcon =
 320                         first from nodes
 321                                 where outgoing_connection
 322                                 order by dclass desc
 323                 goto disconnect
 324
 325         // disconnect
 326
 327 disconnect
 328         if delcon
 329                 disconnect delcon
 330
 331
 332         // next iteration
 333         next (timeout, autoconnect)
 334
 335 }
 336
 337 */
 338
 339
 340 static void periodic_handler(event_loop_t *loop, void *data) {
 341         meshlink_handle_t *mesh = loop->data;
 342
 343         /* Check if there are too many contradicting ADD_EDGE and DEL_EDGE messages.
 344            This usually only happens when another node has the same Name as this node.
 345            If so, sleep for a short while to prevent a storm of contradicting messages.
 346         */
 347
 348         if(mesh->contradicting_del_edge > 100 && mesh->contradicting_add_edge > 100) {
 349                 logger(mesh, MESHLINK_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", mesh->sleeptime);
 350                 struct timespec ts = {mesh->sleeptime, 0};
 351                 clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
 352                 mesh->sleeptime *= 2;
 353
 354                 if(mesh->sleeptime < 0) {
 355                         mesh->sleeptime = 3600;
 356                 }
 357         } else {
 358                 mesh->sleeptime /= 2;
 359
 360                 if(mesh->sleeptime < 10) {
 361                         mesh->sleeptime = 10;
 362                 }
 363         }
 364
 365         mesh->contradicting_add_edge = 0;
 366         mesh->contradicting_del_edge = 0;
 367
 368         int timeout = default_timeout;
 369
 370         /* Check if we need to make or break connections. */
 371
 372         if(mesh->nodes->count > 1) {
 373
 374                 logger(mesh, MESHLINK_DEBUG, "--- autoconnect begin ---");
 375
 376                 int retry_timeout = min(mesh->nodes->count * default_timeout, 60);
 377
 378                 logger(mesh, MESHLINK_DEBUG, "* devclass = %d", mesh->devclass);
 379                 logger(mesh, MESHLINK_DEBUG, "* nodes = %d", mesh->nodes->count);
 380                 logger(mesh, MESHLINK_DEBUG, "* retry_timeout = %d", retry_timeout);
 381
 382
 383                 // connect disconnect nodes
 384
 385                 node_t *connect_to = NULL;
 386                 node_t *disconnect_from = NULL;
 387
 388
 389                 // get cur_connects
 390
 391                 unsigned int cur_connects = 0;
 392
 393                 for list_each(connection_t, c, mesh->connections) {
 394                         if(c->status.active) {
 395                                 cur_connects += 1;
 396                         }
 397                 }
 398
 399                 logger(mesh, MESHLINK_DEBUG, "* cur_connects = %d", cur_connects);
 400                 logger(mesh, MESHLINK_DEBUG, "* outgoings = %d", mesh->outgoings->count);
 401
 402                 // get min_connects and max_connects
 403
 404                 unsigned int min_connects = mesh->dev_class_traits[mesh->devclass].min_connects;
 405                 unsigned int max_connects = mesh->dev_class_traits[mesh->devclass].max_connects;
 406
 407                 logger(mesh, MESHLINK_DEBUG, "* min_connects = %d", min_connects);
 408                 logger(mesh, MESHLINK_DEBUG, "* max_connects = %d", max_connects);
 409
 410                 // find the best one for initial connect
 411
 412                 if(cur_connects < min_connects) {
 413                         splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_asc_lsc_desc, NULL);
 414
 415                         for splay_each(node_t, n, mesh->nodes) {
 416                                 logger(mesh, MESHLINK_DEBUG, "* %s->devclass = %d", n->name, n->devclass);
 417
 418                                 if(n != mesh->self && n->devclass <= mesh->devclass && !n->connection && !n->status.blacklisted && (n->last_connect_try == 0 || (mesh->loop.now.tv_sec - n->last_connect_try) > retry_timeout)) {
 419                                         splay_insert(nodes, n);
 420                                 }
 421                         }
 422
 423                         if(nodes->head) {
 424                                 //timeout = 0;
 425                                 connect_to = (node_t *)nodes->head->data;
 426
 427                                 logger(mesh, MESHLINK_DEBUG, "* found best one for initial connect: %s", connect_to->name);
 428                         } else {
 429                                 logger(mesh, MESHLINK_DEBUG, "* could not find node for initial connect");
 430                         }
 431
 432                         splay_delete_tree(nodes);
 433                 }
 434
 435
 436                 // find better nodes to connect to
 437
 438                 if(!connect_to && min_connects <= cur_connects && cur_connects < max_connects) {
 439                         unsigned int connects = 0;
 440
 441                         for(dev_class_t devclass = 0; devclass <= mesh->devclass; ++devclass) {
 442                                 for list_each(connection_t, c, mesh->connections) {
 443                                         if(c->status.active && c->node && c->node->devclass == devclass) {
 444                                                 connects += 1;
 445                                         }
 446                                 }
 447
 448                                 if(connects < min_connects) {
 449                                         splay_tree_t *nodes = splay_alloc_tree(node_compare_lsc_desc, NULL);
 450
 451                                         for splay_each(node_t, n, mesh->nodes) {
 452                                                 if(n != mesh->self && n->devclass == devclass && !n->connection && !n->status.blacklisted && (n->last_connect_try == 0 || (mesh->loop.now.tv_sec - n->last_connect_try) > retry_timeout)) {
 453                                                         splay_insert(nodes, n);
 454                                                 }
 455                                         }
 456
 457                                         if(nodes->head) {
 458                                                 logger(mesh, MESHLINK_DEBUG, "* found better node");
 459                                                 connect_to = (node_t *)nodes->head->data;
 460
 461                                                 splay_delete_tree(nodes);
 462                                                 break;
 463                                         }
 464
 465                                         splay_delete_tree(nodes);
 466                                 } else {
 467                                         break;
 468                                 }
 469                         }
 470
 471                         if(!connect_to) {
 472                                 logger(mesh, MESHLINK_DEBUG, "* could not find better nodes");
 473                         }
 474                 }
 475
 476
 477                 // heal partitions
 478
 479                 if(!connect_to && min_connects <= cur_connects && cur_connects < max_connects) {
 480                         splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_asc_lsc_desc, NULL);
 481
 482                         for splay_each(node_t, n, mesh->nodes) {
 483                                 if(n != mesh->self && n->devclass <= mesh->devclass && !n->status.reachable && !n->status.blacklisted && (n->last_connect_try == 0 || (mesh->loop.now.tv_sec - n->last_connect_try) > retry_timeout)) {
 484                                         splay_insert(nodes, n);
 485                                 }
 486                         }
 487
 488                         if(nodes->head) {
 489                                 logger(mesh, MESHLINK_DEBUG, "* try to heal partition");
 490                                 connect_to = (node_t *)nodes->head->data;
 491                         } else {
 492                                 logger(mesh, MESHLINK_DEBUG, "* could not find nodes for partition healing");
 493                         }
 494
 495                         splay_delete_tree(nodes);
 496                 }
 497
 498
 499                 // perform connect
 500
 501                 if(connect_to && !connect_to->connection) {
 502                         connect_to->last_connect_try = mesh->loop.now.tv_sec;
 503                         logger(mesh, MESHLINK_DEBUG, "Autoconnect trying to connect to %s", connect_to->name);
 504
 505                         /* check if there is already a connection attempt to this node */
 506                         bool skip = false;
 507
 508                         for list_each(outgoing_t, outgoing, mesh->outgoings) {
 509                                 if(outgoing->node == connect_to) {
 510                                         logger(mesh, MESHLINK_DEBUG, "* skip autoconnect since it is an outgoing connection already");
 511                                         skip = true;
 512                                         break;
 513                                 }
 514                         }
 515
 516                         if(!connect_to->status.reachable && !node_read_public_key(mesh, connect_to)) {
 517                                 logger(mesh, MESHLINK_DEBUG, "* skip autoconnect since we don't know this node's public key");
 518                                 skip = true;
 519                         }
 520
 521                         if(!skip) {
 522                                 logger(mesh, MESHLINK_DEBUG, "Autoconnecting to %s", connect_to->name);
 523                                 outgoing_t *outgoing = xzalloc(sizeof(outgoing_t));
 524                                 outgoing->node = connect_to;
 525                                 list_insert_tail(mesh->outgoings, outgoing);
 526                                 setup_outgoing_connection(mesh, outgoing);
 527                         }
 528                 }
 529
 530
 531                 // disconnect suboptimal outgoing connections
 532
 533                 if(min_connects < cur_connects /*&& cur_connects <= max_connects*/) {
 534                         unsigned int connects = 0;
 535
 536                         for(dev_class_t devclass = 0; devclass <= mesh->devclass; ++devclass) {
 537                                 for list_each(connection_t, c, mesh->connections) {
 538                                         if(c->status.active && c->node && c->node->devclass == devclass) {
 539                                                 connects += 1;
 540                                         }
 541                                 }
 542
 543                                 if(min_connects < connects) {
 544                                         splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_desc, NULL);
 545
 546                                         for list_each(connection_t, c, mesh->connections) {
 547                                                 if(c->outgoing && c->node && c->node->devclass >= devclass) {
 548                                                         splay_insert(nodes, c->node);
 549                                                 }
 550                                         }
 551
 552                                         if(nodes->head) {
 553                                                 logger(mesh, MESHLINK_DEBUG, "* disconnect suboptimal outgoing connection");
 554                                                 disconnect_from = (node_t *)nodes->head->data;
 555                                         }
 556
 557                                         splay_delete_tree(nodes);
 558                                         break;
 559                                 }
 560                         }
 561
 562                         if(!disconnect_from) {
 563                                 logger(mesh, MESHLINK_DEBUG, "* no suboptimal outgoing connections");
 564                         }
 565                 }
 566
 567
 568                 // disconnect connections (too many connections)
 569
 570                 if(!disconnect_from && max_connects < cur_connects) {
 571                         splay_tree_t *nodes = splay_alloc_tree(node_compare_devclass_desc, NULL);
 572
 573                         for list_each(connection_t, c, mesh->connections) {
 574                                 if(c->status.active && c->node) {
 575                                         splay_insert(nodes, c->node);
 576                                 }
 577                         }
 578
 579                         if(nodes->head) {
 580                                 logger(mesh, MESHLINK_DEBUG, "* disconnect connection (too many connections)");
 581
 582                                 //timeout = 0;
 583                                 disconnect_from = (node_t *)nodes->head->data;
 584                         } else {
 585                                 logger(mesh, MESHLINK_DEBUG, "* no node we want to disconnect, even though we have too many connections");
 586                         }
 587
 588                         splay_delete_tree(nodes);
 589                 }
 590
 591
 592                 // perform disconnect
 593
 594                 if(disconnect_from && disconnect_from->connection) {
 595                         logger(mesh, MESHLINK_DEBUG, "Autodisconnecting from %s", disconnect_from->connection->name);
 596                         list_delete(mesh->outgoings, disconnect_from->connection->outgoing);
 597                         disconnect_from->connection->outgoing = NULL;
 598                         terminate_connection(mesh, disconnect_from->connection, disconnect_from->connection->status.active);
 599                 }
 600
 601                 // reduce timeout if we don't have enough connections + outgoings
 602                 if(cur_connects + mesh->outgoings->count < 3) {
 603                         timeout = 1;
 604                 }
 605
 606                 // done!
 607
 608                 logger(mesh, MESHLINK_DEBUG, "--- autoconnect end ---");
 609         }
 610
 611         for splay_each(node_t, n, mesh->nodes) {
 612                 if(n->status.dirty) {
 613                         if(!node_write_config(mesh, n)) {
 614                                 logger(mesh, MESHLINK_DEBUG, "Could not update %s", n->name);
 615                         }
 616
 617                         n->status.dirty = false;
 618                 }
 619
 620                 if(n->status.validkey && n->last_req_key + 3600 < mesh->loop.now.tv_sec) {
 621                         logger(mesh, MESHLINK_DEBUG, "SPTPS key renewal for node %s", n->name);
 622
 623                         if(!sptps_force_kex(&n->sptps)) {
 624                                 logger(mesh, MESHLINK_ERROR, "SPTPS key renewal for node %s failed", n->name);
 625                                 n->status.validkey = false;
 626                                 sptps_stop(&n->sptps);
 627                                 n->status.waitingforkey = false;
 628                                 n->last_req_key = 0;
 629                         } else {
 630                                 n->last_req_key = mesh->loop.now.tv_sec;
 631                         }
 632                 }
 633         }
 634
 635         timeout_set(&mesh->loop, data, &(struct timespec) {
 636                 timeout, prng(mesh, TIMER_FUDGE)
 637         });
 638 }
 639
 640 void handle_meta_connection_data(meshlink_handle_t *mesh, connection_t *c) {
 641         if(!receive_meta(mesh, c)) {
 642                 terminate_connection(mesh, c, c->status.active);
 643                 return;
 644         }
 645 }
 646
 647 void retry(meshlink_handle_t *mesh) {
 648         /* Reset the reconnection timers for all outgoing connections */
 649         for list_each(outgoing_t, outgoing, mesh->outgoings) {
 650                 outgoing->timeout = 0;
 651
 652                 if(outgoing->ev.cb) {
 653                         timeout_set(&mesh->loop, &outgoing->ev, &(struct timespec) {
 654                                 0, 0
 655                         });
 656                 }
 657         }
 658
 659         /* For active connections, check if their addresses are still valid.
 660          * If yes, reset their ping timers, otherwise terminate them. */
 661         for list_each(connection_t, c, mesh->connections) {
 662                 if(!c->status.active) {
 663                         continue;
 664                 }
 665
 666                 if(!c->status.pinged) {
 667                         c->last_ping_time = 0;
 668                 }
 669
 670                 sockaddr_t sa;
 671                 socklen_t salen = sizeof(sa);
 672
 673                 if(getsockname(c->socket, &sa.sa, &salen)) {
 674                         continue;
 675                 }
 676
 677                 switch(sa.sa.sa_family) {
 678                 case AF_INET:
 679                         sa.in.sin_port = 0;
 680                         break;
 681
 682                 case AF_INET6:
 683                         sa.in6.sin6_port = 0;
 684                         break;
 685
 686                 default:
 687                         continue;
 688                 }
 689
 690                 int sock = socket(sa.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
 691
 692                 if(sock != -1) {
 693                         continue;
 694                 }
 695
 696                 if(bind(sock, &sa.sa, salen) && errno == EADDRNOTAVAIL) {
 697                         logger(mesh, MESHLINK_DEBUG, "Local address for connection to %s no longer valid, terminating", c->name);
 698                         terminate_connection(mesh, c, c->status.active);
 699                 }
 700
 701                 closesocket(sock);
 702         }
 703
 704         /* Kick the ping timeout handler */
 705         timeout_set(&mesh->loop, &mesh->pingtimer, &(struct timespec) {
 706                 0, 0
 707         });
 708 }
 709
 710 /*
 711   this is where it all happens...
 712 */
 713 void main_loop(meshlink_handle_t *mesh) {
 714         timeout_add(&mesh->loop, &mesh->pingtimer, timeout_handler, &mesh->pingtimer, &(struct timespec) {
 715                 1, prng(mesh, TIMER_FUDGE)
 716         });
 717         timeout_add(&mesh->loop, &mesh->periodictimer, periodic_handler, &mesh->periodictimer, &(struct timespec) {
 718                 0, 0
 719         });
 720
 721         //Add signal handler
 722         mesh->datafromapp.signum = 0;
 723         signal_add(&mesh->loop, &mesh->datafromapp, meshlink_send_from_queue, mesh, mesh->datafromapp.signum);
 724
 725         if(!event_loop_run(&mesh->loop, &mesh->mutex)) {
 726                 logger(mesh, MESHLINK_ERROR, "Error while waiting for input: %s", strerror(errno));
 727                 call_error_cb(mesh, MESHLINK_ENETWORK);
 728         }
 729
 730         signal_del(&mesh->loop, &mesh->datafromapp);
 731         timeout_del(&mesh->loop, &mesh->periodictimer);
 732         timeout_del(&mesh->loop, &mesh->pingtimer);
 733 }